implemented check for damaged pdfs per bug 187
implemented check for damaged pdfs per bug 187

mlda065/gummi,alexandervdm/gummi,mlda065/gummi,mlda065/gummi,alexandervdm/gummi,turbopobre/gummi,bobi32/gummi,alexandervdm/gummi,bobi32/gummi,bobi32/gummi,turbopobre/gummi,turbopobre/gummi,mlda065/gummi,turbopobre/gummi,bobi32/gummi